[INFO] fetching crate rusty_alfred 0.1.1...
[INFO] testing rusty_alfred-0.1.1 against 1.47.0 for beta-1.48-1
[INFO] extracting crate rusty_alfred 0.1.1 into /workspace/builds/worker-11/source
[INFO] validating manifest of crates.io crate rusty_alfred 0.1.1 on toolchain 1.47.0
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.47.0" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking crates.io crate rusty_alfred 0.1.1
[INFO] finished tweaking crates.io crate rusty_alfred 0.1.1
[INFO] tweaked toml for crates.io crate rusty_alfred 0.1.1 written to /workspace/builds/worker-11/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.47.0" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.47.0" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-11/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-11/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "rustops/crates-build-env@sha256:d92eaeed33fa75130ca1ee6c8a01d1ffb62bac859dfdfb3450e3e5d1c0146529" "/opt/rustwide/cargo-home/bin/cargo" "+1.47.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 8b0d5f905cf6eafc30816d1d8400fcc2fcab82225553138b344e28a29d970e76
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `Command { std: "docker" "start" "-a" "8b0d5f905cf6eafc30816d1d8400fcc2fcab82225553138b344e28a29d970e76", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "8b0d5f905cf6eafc30816d1d8400fcc2fcab82225553138b344e28a29d970e76", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "8b0d5f905cf6eafc30816d1d8400fcc2fcab82225553138b344e28a29d970e76", kill_on_drop: false }`
[INFO] [stdout] 8b0d5f905cf6eafc30816d1d8400fcc2fcab82225553138b344e28a29d970e76
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-11/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-11/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=warn" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "rustops/crates-build-env@sha256:d92eaeed33fa75130ca1ee6c8a01d1ffb62bac859dfdfb3450e3e5d1c0146529" "/opt/rustwide/cargo-home/bin/cargo" "+1.47.0" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 863dc143db5fe3c18e22955118c7dfda94ed40fd967fc525bbdd85efad590b3b
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `Command { std: "docker" "start" "-a" "863dc143db5fe3c18e22955118c7dfda94ed40fd967fc525bbdd85efad590b3b", kill_on_drop: false }`
[INFO] [stderr]    Compiling backtrace v0.2.3
[INFO] [stderr]    Compiling dbghelp-sys v0.2.0
[INFO] [stderr]    Compiling backtrace-sys v0.1.37
[INFO] [stderr]    Compiling syn v0.10.8
[INFO] [stderr]    Compiling serde_json v0.8.6
[INFO] [stderr]    Compiling serde_codegen_internals v0.11.3
[INFO] [stderr]    Compiling error-chain v0.5.0
[INFO] [stderr]    Compiling serde_codegen v0.8.23
[INFO] [stderr]    Compiling serde_derive v0.8.23
[INFO] [stderr]    Compiling rusty_alfred v0.1.1 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]   --> src/lib.rs:21:1
[INFO] [stdout]    |
[INFO] [stdout] 21 | #![feature(proc_macro)]
[INFO] [stdout]    | ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to previous error
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0554`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `rusty_alfred`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `Command { std: "docker" "inspect" "863dc143db5fe3c18e22955118c7dfda94ed40fd967fc525bbdd85efad590b3b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "863dc143db5fe3c18e22955118c7dfda94ed40fd967fc525bbdd85efad590b3b", kill_on_drop: false }`
[INFO] [stdout] 863dc143db5fe3c18e22955118c7dfda94ed40fd967fc525bbdd85efad590b3b
